\begin{tabular}{ L{10cm} C{2.2cm} C{2.2cm} } \hline \hline
& Study sample                  &  National rural population            \\ \hline
\multicolumn{8}{l}{a) Household water quality tests} \\  \addlinespace
Arsenic contamination & 29 & 32 \\
& (1.8) & (1.2) \\
Arsenic contamination (WHO threshold) & 0.63 & 0.61 \\
& (0.017) & (0.009) \\
Arsenic contamination (Bangladeshi threshold) & 0.24 & 0.17 \\
& (0.016) & (0.006) \\
Fecal contamination & 0.65 & 0.63 \\
& (0.010) & (0.010) \\
\hline
\multicolumn{8}{l}{b) Water source quality tests (primary water source)} \\ \addlinespace
Arsenic contamination & 37 & 34 \\
& (2.2) & (1.6) \\
Arsenic contamination (WHO threshold) & 0.69 & 0.59 \\
& (0.018) & (0.011) \\
Arsenic contamination (Bangladeshi threshold) & 0.31 & 0.19 \\
& (0.017) & (0.008) \\
Fecal contamination & 0.54 & 0.39 \\
& (0.010) & (0.011) \\
\hline
\multicolumn{8}{l}{c) Other variables} \\ \addlinespace
Household observed to store drinking water & 0.73 & 0.19 \\
& (0.011) & (0.002) \\
Household reports treating water before drinking & 0.09 & 0.04 \\
& (0.008) & (0.002) \\
Time needed to collect water (minutes) & 2.2 & 15 \\
& (0.04) & (0.27) \\
Water collected per day (litres) & 59 & 79 \\
& (1.2) & (1.2) \\
\hline \hline
\end{tabular}
